Spring-loaded Ratchet Mechanism Minimizes Operator Fatigue by Allowing the Ring to be Compressed or Expanded Through Gradual Moves and then Locks At the Desired Size Without Continued Pressure on the Handles, Heavy and Large Rings are Safely and Easily Controlled, Replaceable Tips in 0 Deg., 45 Deg., and 90 Deg. Make it Possible to Remove and Install Rings in Most Applications. (replacements Available)